I am Suffering From a huge attention problem

First,i am sorry about my poor English because i am a foreigner and found this site while i was searching for information about my problem.
Let me explain my situation
I am a student studying at the university at English Preparatory Program,and I am going to take lectures related to my department following academic year.I didn't have such a problem before last december.The problem i will tell you about now might sound so strange and funny because when i look at myself from another person's perspective,i feel like crazy.I finished the first term as the student who got the best grade among approximately 500 students,about 100 of whom are at my level,intermediate.However,i can't study now as effectively as the first term,in other words,i have a kind of phobia preventing me from studying even over a few hours.I had been capable of studying for hours without any pause until the last december.The problem is that i am conditioned that when i start studying,distractions will prevent me from studying.It could be anything.For example,a normal student gets his/her materials such as dictionary,eraser,books and other required ones like these,and when s/he starts studying,s/he doesn't think about those.S/he just concentrates on the article s/he has to study.However,when i start studying,my mind begins to think and worry about them inevitably,and i can't stop that.It's like somebody whispers something like "the eraser is laid just there and you can't study due to this" my ears.I don't experience this situations only during studying at home or library,but also in the class and during exams.For instance,during an exam,after the instructor distributes the papers,my mind begins to deal with the eraser laying near my hand,or during classes,instead of focusing on what the instructor tells,my mind copes with the eraser laying near the notebook,so i can't concentrate as well as i used to,which makes me feel very anxious and depressive.
There are no enough words to tell how it makes a student feel to lose ability to study,especially for a top student.Until 4 months ago,i was sure that if i continue studying as hard as i used to,i was going to be admitted to one of the top universities in the world after graduation.Everyone i told about my targets agreed that i could succeed what i used to desire.Now,i am thinking about leaving the school and doing a job that doesn't require improved academic skills such as waiter or footboy
I used to spend my most time studying last term,but these days,after returning from the school,i sleep almost three hours a day to kill time,and after dinner,i do my homework and kill time again on the computer,which makes me look so lazy.
I saw a psychiatrist 2 months ago.He analysed me,and decided i was depressed because of some bad incidents i had experienced.He said just give yourself some time,it will go away.He didn't think i needed to take medicine,so he didn't prescribe anything.However,troubles still exist like what they were and i don't think i can take it anymore.
I really don't know what happened to me and what kind of a mental disease it is.Life hasn't been very hard for me so far...

Hi! I suggest you read a book about ADD or ADHD to see if it can develop later in life. Meanwhile, I will study the issue, too.

I also suggest you talk to a doctor or a counselor (is there one at your school) to see what he or she has to say.

Hope things get better soon!

What do you other folks here think about this situation?

It sounds like obsessive compulsive disorder to me. I suggest getting checked out by a psychologist.

Perhaps you should schedule another appt with a psychiatrist, either the same you saw before or a different one, and explain that waiting for time to heal as you were told has not worked and you need more help.

Best of luck.

Thanks for the each reply friends.
Bye the way,i realized that i had unknowingly posted the same thread under this ADD topic.Sorry about that.